Oil-well flow device



May 6, 1930- K. P. NEILSEN 1,757,329

OIL -WELL FLOW DEVICE Filed Feb. 9, 1927 www?? H TRNEX BY. Y v /f/Wm/-Patented May 6, 1939 UNiE fST TENT OFM KARL E. NEILSEN, OF LONGr BEACH,GJFOBNIA OILrWELL FLOW DEVICE In flow devices heretofore in'use the gasunder pressure was forced down into the casing and consequently exerteda pressure against the oil formation at the bottom of the well which wasextremely detrimental, in that the oil was forced away from the well andcaused it to stop iowing..

An object of my invention 1s to provide a flow device in which there isno pressure exerted on the oil formation.

Another object is to provide a flow device in which liquid is drawn intoa. chamber by the action of a piston and is again forced out of thechamber by the opposite movement of the piston, said piston beingactuated by the gas pressure.

Still another object is to provide a flow device comprising adisplacement pump and a gas injection means.

Other objects, advantages, and features of invention may appear fromtheaccompanying drawing, the subjoined detailed description, and theappended claims.

In the drawing:

Fig. 1 is a longitudinal section view of my flow device in pcsition in awell.

Fig. 2 is an enlarged sectional view `taken on line 2, 2, Fig. 1.

Referring more particularly to the drawme: l

2'zlhe usual well casing 1 is provided and a packer 2 is set in saidcasing above the usual perforations in said casing thus providing a gaspressure chamber 3 in the casing which chamber is not open to the liquidbearing sands. A standing valve 4 of well-known construction ispositioned in the packer 2, or above said packer, as will be foundsuitable in any specific installation. Flow pipe 5 rises from the packer2 to the top of the well and the packer is preferably secured to thelower end of said pipe. A liner 6 is provided in the pipe 5 and isimmovably secured therein, said liner` being substantially the samelength as the stroke of the flow device, as will be further described.

A tube 7 extends through the liner 6 and is slidable therein, said tubebeing provided with a piston 8 at its upper end, and a piston 50 9 atits lower end, and the tube extends through said pistons and is open tothe space above and below the pistons. A check valve 10 is provided inthe lower end of the tube 7 and a second check valve 11 is provided inthe upper end of t-he tubing.

- Ports 12 are provided in the pipe 5 adjacent the lower end of theliner 6 and ports 13 are provided in the pipe adjacent the upper end ofthe liner. The purpose of these ports is to admit gas under pressurefrom the chamber 3 causing said gas to exert a pressure against thepistons 8, 9 and cause them to reciprocate. A sleeve 14 is fitted withinthe pipe 5 and is adapted and arranged to control the ports 12, and asecond sleeve 15 is positioned within the pipe 5 to control the ports13'. i The sleeves 14, 15 are connected by rods 16 which extend throughthe liner 6 and are slidable therein. l

1 The operation of my How device is as folows:

Gas under pressure is forced into the cham bei' 3 and in the positionshown in Fig. 1 enters the ports 13 exerting an upward pressure againstthe bottom of the iston 8, causing the pistons 8, 9 and tube to moveupwardly and draw in a charge of liquid past the standing valve 4. Theupward movement of the pistons continues until the piston 9 engages thesleeve 14 moving said sleeve 80 upwardly and also moving the sleeve 15upwardly because of the connecting rods 16. This upward movement of thesleeve opens the` ports 12 and closes the ports 13. At the S- extremeupward'position of the piston 9 the ports 17 in the tube 7 are above theliner 6. This permits the pressure below the piston 8 to be relievedthrough the tube and causes the gas to pass upwardly into the column inthe pipe 5, thereby materially lightening the liquid in said column.

The ports 12 being now open and the ports 13 being closed, pressure 'isexerted on the top of the piston 9 causing said piston to movedownwardly along with the piston 8 and tube 7 until the piston 8 engagesthe sleeve 15 to move said sleeve 15 and sleeve 14 downwardly into thepiston shown in Fig. 1. The ports 17 extend below the liner 6 to relievethe pressure in the chamber above the piston 9 thus causing the cycle.

The check valve 10 and 11 prevent any gas pressure from being exerted onthe standing valve 4 and also retain the liquid column in the tube 5preventing it from passing downwardly during the up stroke of thepistons.

Having described my invention, I claim:

1. A well flow device including a casing, packer means in said casing, ailow pipe in the casing, piston means reciprocally mounted in said flowpipe, said pipe having ports provided therein throu h which Huid underpressure is adapted to ow, and means operable by said reciprocallymounted means adapted to control said ports, and said reciprocallymounted piston means having ports therein through which the fluid underpressure is relieved into the liow pipe.

2. In a well including a casing, a flow de- Vice comprising a packer insaid'casing, a standing valve, a flow pipe rising from the packer, apair of pistons reciprocally mounted in said pipe, tubing connectingsaid pistons, said pipe having ports therein through which uid underpressure is adapted to flow to reciprocate said pistons, and meansoperable by said pistons adapted to control said ports, and said tubinghaving relief ports therein for the pressure fluid.

3. In a well including a casing, a flow device comprising a packer insaid casing, a

standing valve, a How pipe rising from the' packer, a pair of pistonsreciprocally mounted in said pipe tubing connecting said pistons, saidpipe having ports therein through which fluid under pressure is adaptedto flow toreciprocate said pistons, and means operable by said pistonsadapted to control said engaged by the pistons to control said ports,valve means in the tube, said tube havin ports therein adapted to extendabove an below the liner to relieve the pressure above and below saidliner.

6. In a well including a casing, a flow device comprising a packer, piperising from the packer, a pair of pistons reciprocally mounted in thepipe, a tube connectin said pistons, a liner through which said tu eextends, said pipe having luid inlet ports therein above and below saidliner` adapted to admit fluid under pressure whereby the pistons arereciprocated, sleeves above and below the liner, rods connecting saidsleeves, said sleeves being adapted to'be engaged by the pistons tocontrol said ports, a standing valve in said packer, and pressure reliefmeans in said tube whereby the fluid under pressure is relieved. i

7. In a wellincluding a casing,l a flow device comprising a packer, piperising from the packer, a pair of pistons reciprocally mounted. in thepipe, a tube connecting said pistons, a liner through which said tubeextends, said pipe having ports above and below said liner through whichfluid under pressure is adapted to pass to reciprocate the pistons,sleeves above and below the liner adapted to control the ports, rodsextending through the liner and secured to said sleeves, saidtubephaving ports therein adapted to extend above or below the liner torelieve the pressure-above or below said liner, a check valve in saidtube, and a standing valve in said liner.

In testimony whereof, I aiiix my signature.

YKARL P. NEILSEN.

ports, and a check valve in said tubing, and v said tubing having reliefports therein for the pressure fluid.

4. In a well including a casing, a flow device comprising a packer, piperising from u the packer, la pair of vpistons reciprocally mounted inthe pipe, a ,tube connecting said pistons, a liner through which saidtube eX- tends, said pipe having lluid inlet ports therein above andbelow said lin'er adapted to admit fluid under pressure whereby thepistons are reciprocated, sleeves above and below the liner, saidsleeves being adapted to be engaged bythe pistons to control said ports,and pressure relief means in said tube whereby the fluid under pressureis relieved.

5. In a well including a casing, a flow device comprising a packer, piperising from the packer, a pair of pistons reciprocallyv mounted in thepipe, a tube connecting said pistons, a liner through which said tubeextends, said pipe having fluid inlet ports there- 1n above andbelowsaid liner adapted to' admit Huid under pressure whereby-thepistons are reciprocated, sleeves above and below the liner, saidsleeves being adapted to be

